lzf_d.c

/* * Copyright (c) 2000-2005 Marc Alexander Lehmann <schmorp@schmorp.de> * * Redistribution and use in source and binary forms, with or without modifica- * tion, are permitted provided that the following conditions are met: * * 1. Redistributions of source code must retain the above copyright notice, * this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * 3. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER- * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE- * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH- * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED * OF THE POSSIBILITY OF SUCH DAMAGE. * * Alternatively, the contents of this file may be used under the terms of * the GNU General Public License version 2 (the "GPL"), in which case the * provisions of the GPL are applicable instead of the above. If you wish to * allow the use of your version of this file only under the terms of the * GPL and not to allow others to use your version of this file under the * BSD license, indicate your decision by deleting the provisions above and * replace them with the notice and other provisions required by the GPL. If * you do not delete the provisions above, a recipient may use your version * of this file under either the BSD or the GPL. */#include "lzfP.h"#ifdef VBOX#include "lzf.h"#endif#if AVOID_ERRNO# define SET_ERRNO(n)#else# include <errno.h># define SET_ERRNO(n) errno = (n)#endifunsignedint
lzf_decompress (constvoid *const in_data, unsignedint in_len,
void *out_data, unsignedint out_len)
{
u8 const *ip = (const u8 *)in_data;
u8 *op = (u8 *)out_data;
u8 const *const in_end = ip + in_len;
u8 *const out_end = op + out_len;
do
{
unsignedint ctrl = *ip++;
if (ctrl < (1 << 5)) /* literal run */
{
ctrl++;
if (op + ctrl > out_end)
{
SET_ERRNO (E2BIG);
return 0;
}
#if USE_MEMCPY memcpy (op, ip, ctrl);
op += ctrl;
ip += ctrl;
#elsedo
*op++ = *ip++;
while (--ctrl);
#endif }
else/* back reference */
{
unsignedint len = ctrl >> 5;
u8 *ref = op - ((ctrl & 0x1f) << 8) - 1;
if (len == 7)
len += *ip++;
ref -= *ip++;
if (op + len + 2 > out_end)
{
SET_ERRNO (E2BIG);
return 0;
}
if (ref < (u8 *)out_data)
{
SET_ERRNO (EINVAL);
return 0;
}
*op++ = *ref++;
*op++ = *ref++;
do
*op++ = *ref++;
while (--len);
}
}
while (op < out_end && ip < in_end);
return op - (u8 *)out_data;
}